Metamorphic
Brecciated Quartzite
Brecciated Quartzite
Hardness of ~7 on the Mohs scale, typically gray, white, and black mottled colors, dull to waxy luster, massive crystalline structure with prominent angular fragments (breccia) cemented together, no cleavage, specific gravity around 2.6-2.7.
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Physical properties
Hardness of ~7 on the Mohs scale, typically gray, white, and black mottled colors, dull to waxy luster, massive crystalline structure with prominent angular fragments (breccia) cemented together, no cleavage, specific gravity around 2.6-2.7.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone, followed by tectonic fracturing and subsequent cementation (often by silica) creating the brecciated texture.
Uses & applications
Used primarily as decorative stone, in landscaping, and sometimes cut and polished for lapidary uses or collecting.
Geological facts
The brecciated texture indicates a history of intense geological stress and faulting after the initial metamorphism.
Field identification & locations
Identifiable by its high hardness (scratches glass), massive quartz composition, and distinct angular fragments within the matrix. It is commonly found in areas with a history of significant tectonic activity.
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